Eccentric



F. HORNBY.

ECCENTRIC.

APPLICATION FILED AUG- 3i. 1921.

1,412; 17. Patented Apr. 11, 192 2.

Tiql- INVENTOR Hun/4 ffarnfiy BY D W aw ATTORNEY5 mm nomr, or LIvnarooL, ENGLAND, assrenoa '10 MECCANO LIMITED 01* mvnaroor, ENGLAND, A narrrsn coarom'r'rorw.

Eccmvrarc.

subject of the King new and use Be it known that I, FRANK Hoimnv, a

ing at Liver ool, ngland, have invented a 1 Improvement in Eccentrics,

of which the following is a specification.

-This invention relates to an eccentric for built up 'into'models models made use in the building of constructional toys or up. of interchan eable parts, the various parts being capa 1c of being which may afterwards and the parts used in It is desirable in such constructional toy systems for each;

be taken to pieces part to have several uses, and that the parts in order to be economically." manufactured and in quantity should be'made from sheetmetal by press tools.

According to this invention, the eccentric sheave consists of a central disc and two outer cheek plates of slightly larger diameter than the central disc thus forming a peripherally flanged. sheave. The eccentric strap is a single piece sheet-metal stamping consisting of a ring adapted to fit over the central disc between the projecting flanges, provided with an arm in which are one or more perforations by means of which the eccentric can be pivotally conapertures for t nected to the partto be reciprocated. The

flanged eccentric sheave formed by the three discs is rovided with oneor more he rod or'shaft eccentric to the sheaves, and where a series of such eccentric apertures is provided they may be arranged at different radial distances from the sheave centre to enable the eccentric to have different throws.

One embodiment of the invention is illustrated in the accompanying drawings in which:

Fig. 1' shows an eccentric strap;

Fig. 2 shows a perforated central disc of a sheave;

Fig. 3 shows a cheek plate of a sheave; Fig. 4 shows an assembled eccentric connected to a perforated strip;

Fig. 5 is a' section of such on line 55 of Fig. 4; and

Figs.'6 and 7 are fragmentary views similar to Fig. 4 illustrating different throws of the eccentric.

The eccentric consists of a strap, Fig. 1,

eccentric taken Specification of Letters Patent on whic of Great Britain, resid- Patented Apr. 11, 1922.

a plication filed August 31, 1921. Serial No. 497,239.

of stam ed sheet-metal comprising a ring 1 is an arm 2, the latter having one or more perforations 3 the pitch ofwhich may advantageously conform to the standard pitch of the perforations in the other parts of the constructional to system. The sheave of the eccentric is built up of three stamped sheet-metal plates, Figs. 2 and 3, a central disc plate 4 of such a diameter as to fit Within the bore 5 of the strap 1 and two sheet-metal outer cheek plates 6. The plate 4 and two plates 6 are secured together by riveting after the strap 1 hasbeen positioned round the central discand between the outer plates. This may be effected by means of tubular bosses 8, reduced portions 9 on which are passed'through apertures 10 formed in the cheek plates and the central disc and riveted over at 11 to secure the three plates together. The bosses have bores 12, as shownsothat a driving rod orto be set so as to give different throws. As

shown in Figs. 4, 6 and 7, the bosses 8 are spaced at different radial distances from the centre of the sheave, so that the throw of the eccentric may be made small, medium or large by inserting'the shaft 13 in a particular one of the bosses, the resulting throw in each case being indicated by dotted circles in said figures.

In operation the arm 2 of the eccentric is bolted at 14 by one of its end holes to a sliding strip or rod 15 or other element of the toy system-which it is desired to reciprocate, the strip in the-form shown sliding in guides 16.

An eccentric as described may be very cheaply manufactured entirely from stamped sheet-metal parts, and owing to the different throws available due to the different eccentricities of the apertures in the various bosses 8, it may be utilized in a variety of ways. Although only three riveting bosses have been shown, it is obvious that four or a greater number of bosses might be provided and the range of eccentricity thus further increased.

What I claim is:

1. An eccentric, comprising a circular sheet-metal disc having a number of eccentric perforations each adapted to receive a bearing for the eccentric shaft, an eccentric strap to cooperate with said disc, and means for maintaining said strap and disc in operative relation.

2. An eccentric, comprising a circular sheet-metal disc having a plurality of eccentric perforations, said perforations being of various eccentricity, an eccentric strap to cooperate with said disc, means for maintaining said strap and disc in operatlve relation, and tubular bearing-elements for said perforations.

3. A sheave for eccentrics, comprising a circular sheet-metal disc of one diameter and having a number of perforations, two sheetmetal discs of larger diameter and having perforations registering with said firstnamed perforations, and means for securing said circular disc between said larger discs, said means comprising a plurality of tubular bearing-elements mounted in said registering perforations.

4. An eccentric for use in the construction of working models, toys or the like, embodying a sheave comprising three sheet-metal discs, the central disc being circular and of different diameter than theother two discs, a strap comprising a stamped sheetmetal closed ring fitting said central disc, and an arm on the ring provided with erforations to register with standard pltch perforations on other elements of a toy building outfit.

5. An eccentric for use in the construction of working models, toys or the like, comprising a sheave built up from three sheet-metal discs, the central disc being of smaller diameter than the outer discs, and a number of tubular rivets to hold the three discs together and provide bearing surfaces.

6. In combination with a flanged sheave built up of sheet-metal discs secured together, an eccentric strap formed of a sheet metal stamping and comprising a closed ring fitting the sheave and an arm on the ring.

FRANK HORNBY. 

